Flaoting point equality in if then's

I have read some of the many discussions on gloating point problems, perhaps there is a white paper I shoudl know about? Whatis the solution for comparing a floating point variable to a value in an if then? I have defined the value as a typed conatant and that seems to work sometimes. Any insight would be appreciated.

the prob of sig digits can be complex. even 2 floats that should have the same value, may not due to rounding errors. Suggested that you limit the prescision required ex. lo_bound < x < hi_bound or x >= hi_bound.

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Here's the comment as an answer. I've never really seen anything explicitly covering the floating point comparison problems, at least in terms of something you can read up on. They are considered a natural consequence of rounding loss of precision (and in my experience have always been mentioned in that context). What usually happens is you get bitten by it and don't do it again (well, at least not very often!)

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